750E91: "Sprinkler system that rotates about a central point near Strasburg."
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Caption further reads, "Inventor Frank Zybach. Hydraulic cylinders power ratchet device to move wheels. Auto controlled valves to regulate wheel speed. Nozzles are variable in size." This is an early, perhaps the first, "Zybach Self Propelled Sprinkling Irrigation Apparatus," the original self-propelled center pivot irrigation system. Location may be Ernest Englebrecht's farm north of Strasburg, Colorado.